The upright net at the top is folded into a cube. Which of the nets (a) to (d) gives a cube with exactly the same three pairs of opposite letters?

Top net: the column B, D, H, J wraps round into a ring, so B is opposite H and D is opposite J; C and G stick out on either side of D, so C is opposite G. Net (a): B and H, above and below the row, are opposite, and in the row D G J C the squares one apart give D–J and G–C: the same three pairs. All four nets keep B opposite H, but (b) pairs D with G, (c) pairs C with D and (d) pairs D with C.